Effect of cyhalofop-butyl for annual grass weed control in rain-fed rice.

In 2002, two experiments werecarried out in the municipality of Tres Valles, Ver., Mexico, inorder to evaluate the effectiveness of cyhalofop-butyl on theannual grass weed control in rain-fed rice cv MilagroFilipino. A randomized complete block design with seventreatments and four replications was u...

In 2002, two experiments werecarried out in the municipality of Tres Valles, Ver., Mexico, inorder to evaluate the effectiveness of cyhalofop-butyl on theannual grass weed control in rain-fed rice cv MilagroFilipino. A randomized complete block design with seventreatments and four replications was utilized for bothexperiments. Cyhalofop-butyl was evaluated at 180, 225,270, 315 y 360 g/ha, propanil at 4320 g/ha and a weedy checkwere also included. The treatments were applied when therice plants had a height of 25 cm. Annual grass weeds presentin the experiments, were junglerice and Southern crabgrass[Digitaria ciliaris (Retz.) Koeler]. Grass weed control andtoxicity to rice were evaluated at 15, 30 and 45 days afterapplication. The highest junglerice and Southern crabgrasscontrols were obtained when cyhalofop-butyl was applied at315 and 360 g/ha. The different dosages of this herbicide, didnot cause any toxicity to rice. The effect of propanil on weedswas similar to that of cyhalofop-butyl at 360 g/ha during thefirst 15 days after application.

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